Die head with locking means for cam operated chaser supporting member



Dec. 17, 1957 WALLACE 2,816,300

DIE HEAD WITH LOCKING MEANS F OR CAM OPERATED CHASER SUPPORTING MEMBER Original Filed Feb. 24, 1950 2 Sheets-Skeet 1 INVENTOR. fizciwvA/l ailac 2-. ATTOIP/YA-K R. A. WALLACE Dec. 17, 1957 DIE HEAD WITH LOCKING MEANS FOR CAM OPERATED CHASER SUPPORTING MEMBER Original Filed Feb. 24, 1950 2 Sheets-Sheet 2 C 2. m m 4 M 0 m Unitd States Patent DIE HEAD WITH LOCKING MEANS FOR CAM OPERATED CHASER SUPPORTING MEMBER Richard A. Wallace, Port Kennedy, Pa.

Original application February 24, 1950, Serial No.

45,974, now Patent No. 2,692,996, dated November 2,

1954. Divided and this application November 1, 1954, Serial No. 465,861

Claims. (Cl. -96) This invention relates to an improved threading assembly for use on screw or pipe threading machines.

This application is a division of my previously filed co-pending application, Serial No. 145,974, entitle-d Lubrication Means for a Pipe Cutting and Threading Machine, filed February 24, 1950, and which is now U. S. Patent No. 2,692,996 issued November 2, 1954.

One of the objects of this invention is to provide a portable machine having simplified interchangeable threading assemblies to thread the various pipe and bolt sizes within the capacity of the machine, these threading assemblies being of the radial opening type, simple and easy to install and remove from the machine, having a common opening mechanism rotatably attached to the carriage, and being opened and closed by a single operating handle.

Other objects and advantages of the invention will become apparent in the course of the following detailed description, taken in connection with the accompanying drawings wherein:

Fig. 1 is a top plan view of the threading assembly mounted on the movable carriage of a threading machine;

Fig. 2 is a side elevational view of the threading assembly mounted on the machine as illustrated in Fig. 1;

Fig. 3 is an end elevation as observed from the right end of Figs. 1 and 2 wherein the threading assembly is shown in solid lines in its cutting position, and in dotted lines in make-up position;

Fig. 4 is a side elevational view of the diehead frame assembly with the threading assembly removed;

Fig. 5 is a view partially in top plan and partially in horizontal section of the diehead frame assembly, the view being in the plane of'line 5-5 ofFig. 4;

Fig. 6 is an end elevational view of the diehead frame assembly, illustrated in Figs. 4 and 5;

Fig. 7 is a side elevational view of the threading assembly;

Fig. 8 is a sectional view taken on line 8-8 of Fig. 7;

Fig. 9 is an elevational view of one of the chasers of which several are included in the threading assembly;

Fig. 10 is an edge elevational view of the chaser as observed from the left of Fig. 9.

Referring now in detail to the drawings, a carriage 70 which is slidably disposed on the tracks of the frame portion of a threading machine as shown in Figs. 1 to 3 is adaptedfor support of a diehead'frame assembly including a threading mechanism, whichis the subject of this invention, and a cut-off and reamer mechanism which is the subject of my copending restricted application. Serial No. 576,296 entitled Cut-01f and Reamer Means for Pipe Cutting and Threading Machine, filed April5, 1956.

The die head frame assembly (Figs. 4-10) comprises a frame 90 which includes a base plate91 and a;housing portion 92 which are suitably rigidly connected together and the housing portion is cutaway at-the top for visibility of'the chasers and atth'e bottom "for chip disposal. The "base plate 91 is provided with apair of 2,816,300 Patented Dec. 17, 1 57 spaced parallel ribs 93 for slidable support thereon of the cut-off and reaming assembly as disclosed in more detail in my copending application, Serial No. 576,296, identified above.

The frame extends transversely of the main frame portion 13 and the base plate 91 is provided with a tapped boss 94 in which the threaded end of a hollow bolt is secured whereby the hollow bolt is pivotally supported in an aperture in the standard 78 which is disposed interiorly of the frame. In other words, the bolt provides a pivotal support for the housing 92 and moves therewith when the housing is pivoted to make-up position.

Theopposite standard 79 extends upwardly through an opening 95 (Fig. 6) in the bottom of the frame and the upper end of the standard engages a suitable stop in the frame.

In accordance with this construction, both the die head frame assembly and the cut-off and reaming assembly are pivotally supported on the carriage 70. The base plate 91 has one end of a cylindrical sleeve 96 threaded thereinto and which sleeve provides a work clearing opening 97. The sleeve 96 at its opposite or free end is provided with an outwardly directed flange 98 which together with the base plate provides a circular groove in which is rotatably supported the base 99 of a cam memher 100. The cam member includes a plurality (preferably four) of arcuate flanges 101 which are eccentric to .the center sleeve 96, and arranged in the same order circumferentially of said center and have depressions 100a and curved ends 101a the purpose of which will later appear.

A stud 102 projects from the base plate 91 and on which is rotatably supported a block 103.

An arm id idepends rigidly from the block 103 and the arm is pivotally connected at 105 to one end of a link 106 whose opposite .end is pivotally connected at 107 to an arm 108 rigid with the cam member 100. A rod 109 projects from the block 103 and extends upwardly through a slot 110 in the frame and is provided at its upper end with a hand engageable operating knob 1 11. The construction above described provides for rotary movement of the cam member 100 in opposite directions upon corresponding movements of the rod 109 and for a toggle lockingof the cam member 100 when in a closed position.

Aplurality of threading assemblies, as shown in Figs. 7 and 8 are provided in the machine, each of said assemblies supporting chasers 127 capable of threading a diiferent size pipe or bolt within the capacity of the machine.

The stud 102 is extended at 112 and such extension together with a stud .113 engage within apertured bosses 114 and 115 projecting from the plate 116 of the threading assembly, which as shown in Fig. 5, is flush with the outer wall of the housing.

As shown, note Fig. 7, the plate116 includes upper and lower ears 117 and 118 from which the bosses .114 and 115 project, said plate is of symetrical form so that either of the bosses 114 or 115 mayengage the stud 113.

A chaser supportingcircular .plate 120 is supported by and in contact with ,the,p1a te'11,6 and is .roti tably adjustable relative thereto forapurpose later to appear.

The rotatable adjustment is effected bymean sofa pair of olts .12 ca ried the p at 9 1. h h aeists through circumferentially elongated slots 122111 the 1 plate 120, the @plates being .locked in any relative. adjustment by means of nuts123 on the bolts 121. 2L

The plate 120 rigidly supports a plurality (.preferably four) of chaser guiding brackets 124 which as shown are in the retai er-rectangular bloeks havi ng radially brackets 124 when the threading assembly in which they are slidably disposed is not mounted on the die head frame assembly a leaf spring 129 is rigidly connected to each bracket at one end thereof as indicated at 130 and the free end of the spring is provided with a small extension 131 projecting through an aperture in the bracket which engages a depression 131a in the face of the corresponding chaser and holds it in a retracted position.

Removal of a threading assembly from the die head frame assembly may be accomplished only when the chasers are in their retracted position. The corresponding position of the rod 109 for the retracted position of the chasers is shown in phantom in Fig. 4. In this position the locking lug 119 attached to the block 103 is adjacent to either the ears 117 or 118 of the threading assembly,

but not overlapping it, and thus allowing removal of same.

At this time also the depressions 100a in the cam 100 are directly behind the slots 128 in the chasers 127 to insure easy removal.

When another threading assembly is mounted on the studs 112 and 113 and the rod 109 is pulled towards the operator causing the cam 100 to rotate in a clockwise direction when viewed as in Fig. 4, the curved edges 101a will first engage the slots 128 in the chasers 127, forcing said chasers into correct alignment with the cam flanges 101. As the cam flanges 101 cause the chasers 127 to move radially inward the springs 129 will pop out of the depressions 131a. At the same time the lug 119 attached to the block 103 will rotate as indicated in Fig. 4 as to overlap the car 117 or 118 of the plate 116 and prevent the threading assembly from being removed from the studs 112 and 113 while the chasers are in the threading position.

By changing the circumferential position of the plate 120 relative to the plate 116 the chasers 128 are made to thread a slightly different diameter when in the threading position. This will allow for chaser sharpening and oversize threads. The depressions 100a in the cam flanges 101 are sufliciently long enough to allow for a wide range of incremental sizes above and below the nominal size of the chasers.

Having described in detail the mechanical construction of the novel threading mechanism, the operation thereof may be briefly stated as follows:

A pipe to be threaded is introduced into the chuck assembly and gripped as described in detail in my U. S. Patent No. 2,591,389. The pipe may then be cut to the desired length in the manner described in detail in my United States Patent No. 2,692,996.

After the cutting-01f operation, the pipe end is ready for threading which is carried out by moving the carriage 70 away from the end of the pipe far enough to clear the chasers 127.

The chasers 127 are then closed by pulling the handle down or towards the operator, and are started threading by bringing them into engagement with the cut-off end of the pipe upon movement of the carriage 70 by the hand wheel 77. Once started, the chasers alone will move the carriage.

Cutting oil is fed in a steady stream through the conduit 178 directly over the chasers.

When suflicient thread has been cut, the chasers 127 are lifted by moving the handle 109 up or away from the operator.

When it is desired to thread other size pipe the threading assembly may be readily removed from the supporting studs 112 and 113, in the manner previously described.

From the above detailed disclosure of the present invention, it will be observed that a novel diehead threading assembly is provided which is capable of threading pipe or bars with accuracy, in a brief period of time with minimum attention and exertion on the part of the operator.

While I have disclosed my invention in accordance with a single specific structural embodiment thereof, such is to be considered as illustrative only, and not restrictive, the scope of the invention being defined in the sub-joined claims.

' What I claim and desire to secure by U. S. Letters Patent is:

l. A threading assembly comprising a supporting frame, a member rotatably supported by said frame and having a circular opening therein, said member having a plurality of cam flanges eccentric to said opening, a removable chaser supporting structure comprising a pair of discs supported by said frame in spaced relation to said member axially of said opening, said discs having circular pipe admission openings therein axially aligned within said first opening, one of said discs being fixedly mounted to said frame, and a plurality of chasers having slots therein receiving said flanges, said chasers being movably supported in guide brackets carried by the other disc for movement radially of said openings, said discs being connected for relative circumferential adjustment to vary the thread diameter cut by the chasers by rotating the other disc relative to the fixed one disc and thus changing the radial position of the operative connection between the chasers and the cam flanges.

2. The structure according to claim 1, together with a leaf spring having one end thereof connected to each bracket and the springs having free ends engageable with the respective chasers for frictionally holding same in the brackets in a retracted position when not mounted on the machine.

3. In a portable pipe threading machine, a housing having an opening in a side Wall thereof, chaser adjusting means rotatably supported in the housing, a lever rotatably supported on a stud connected to the housing and projecting through said opening, operative connections between said adjusting means and said lever, a chaser supporting plate removably disposed in said opening and having an apertured ear receiving said stud, and a lug on said lever engageable over an edge of said ear for retaining said plate in position upon movement of said adjusting means to operative position of said chasers.

4. A threading assembly comprising a box-like frame, a member rotatably supported by a side wall of said frame and having a circular opening therein, said member having a plurality of cam flanges eccentric to said opening, an operating handle pivotally supported by said frame, said handle carrying a locking means, a toggle operating connection between the member and the handle, a chaser supporting plate, said plate being removably supported by said frame in spaced relation to said member axially of said opening, said plate having a circular opening therein axially aligned with said first opening, a plurality of chasers movably supported by said plate for movement radially of said openings, slots in said chasers receiving said flanges, said locking means engaging and disengaging said plate upon pivoting the handle to cause the chasers to move to an operative position and to hold the member in a fixed position.

5. A threading assembly comprising a supporting frame, a manually rotatable cam pivotally carried by said frame, a chaser supporting member removably carried by said frame, said member having a plurality of chasers supported thereon and at least one locking surface, means providing radial sliding movement of said chasers relative to a common center, a handle movably supported by the frame and operativeconnections between the handle and the rotatable cam, whereby movement of the handle in one direction Will cause the chasers to move inwardly relative to the supporting member and cause the member to become locked relative to the frame, and whereby movement of the handle in the opposite direction will 5 cause the chasers to move outward relative to the supporting member and cause the member to become unlocked relative to the frame.

References Cited in the file of this patent UNITED STATES PATENTS Wieland July 14, 1903 Shaw July 13, 1915 Sternberg Feb. 19, 1935 Pealer Dec. 16, 1941 Vosper June 16, 1953 Nygren Oct. 19, 1954 

